Structure for flexible printed circuit boards

ABSTRACT

A flexible printed circuit board installed on a substrate in a display device is provided.

This application is a Continuation of application Ser. No. 14/904,551,filed on Jan. 12, 2016, which was a national stage entry ofPCT/KR2014/006732, filed Jul. 24, 2014, and claims the benefit of andpriority to Korean Patent Application No. 10-2013-0087522, filed on Jul.24, 2013, which are hereby incorporated by reference for all purposes asif fully set forth herein.

TECHNICAL FIELD

The present invention relates to a structure of a flexible printedcircuit board installed on a substrate in a display device.

BACKGROUND ART

A flexible printed circuit board is an electronic component that isdeveloped as electronic products become miniaturized and light-weighted,and has excellent workability, heat resistance, bendability, andchemical resistance. The flexible printed circuit board has a strongresistance against heat, and has been widely used as a core component ofevery electronic product, such as an organic light emitting diode, acamera, a computer and peripheral devices, a cellular phone, avideo/audio device, a camcorder, a printer, a DVD, a TFT LCD, satelliteequipment, military equipment, or medical equipment.

In the display device, the flexible printed circuit board for powersupply serves to connect a power supply portion and pixel portions toeach other so that a power is supplied from the power supply portion tothe respective pixel portions. In the display device, two or moreflexible printed circuit boards are arranged on outer sides of the pixelportions, and anodes and cathodes are conducted group by group toconnect the power supply portion to the respective pixel portions.

In this case, in order to efficiently supply the power, it is importantto adjust the shape and the arrangement structure of the flexibleprinted circuit board.

DISCLOSURE Technical Problem

The present invention provides a structure of a flexible printed circuitboard installed on a substrate in a display device.

Technical Solution

According to one aspect of the present invention, there is provided astructure of a flexible printed circuit board, which includes: asubstrate; two or more flexible printed circuit boards positioned atedges on the substrate and mounted with anode pads and cathode pads; andat least one of a soldering portion and a wire bonding portion whichrespectively make the anode pads and the cathode pads mounted onneighboring end portions of the flexible printed circuit boards conductelectricity.

Advantageous Effects

In accordance with the present invention, since an additionalconfiguration, such as an equipotential flexible printed circuit board,is not required when the two or more flexible printed circuit boards areconnected, the process can be simplified, and the manufacturing costscan be saved.

DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a structure that makes two or moreflexible printed circuit boards conduct electricity in the related art.

FIG. 2 is a diagram illustrating a flexible printed circuit board inaccordance with an embodiment of the present invention.

FIG. 3 is a diagram illustrating a flexible printed circuit board inaccordance with another embodiment of the present invention.

FIG. 4 is a diagram illustrating a gap distance between flexible printedcircuit boards.

FIG. 5 is a diagram illustrating a structure of a flexible printedcircuit board in accordance with an embodiment of the present invention.

FIG. 6 is a diagram illustrating a structure of a flexible printedcircuit board in accordance with another embodiment of the presentinvention.

FIG. 7 is a diagram illustrating a structure of a flexible printedcircuit board in accordance with other embodiment of the presentinvention.

FIG. 8 is a diagram illustrating a structure of a flexible printedcircuit board in accordance with other embodiment of the presentinvention.

FIG. 9 is a diagram illustrating a portion in which a lower flexibleprinted circuit board and an upper flexible printed circuit boardoverlap each other.

FIG. 10 is a diagram illustrating a portion in which a lower flexibleprinted circuit board and an upper flexible printed circuit board of amultilayer structure overlap each other.

FIG. 11 is a diagram illustrating the manufacturing order of a structureof a flexible printed circuit board and an organic light emitting diodeincluding the structure according to an embodiment of the presentinvention.

FIG. 12 is a side view illustrating an organic light emitting diodeincluding a structure of a flexible printed circuit board according toan embodiment of the present invention.

MODE FOR INVENTION

Hereinafter, the present invention will be described in detail.

As illustrated in FIG. 1, in the related art, two or more flexibleprinted circuit boards are installed on a substrate, and equipotentialflexible printed circuit boards are installed and soldered in endportions of the flexible printed circuit boards that are spaced apartfrom each other to make the flexible printed circuit boards conductelectricity. The above-described method has been used to secureallowable current when the flexible printed circuit boards that arespaced apart from each other conduct electricity with each other.

In accordance with the present invention, when two or more flexibleprinted circuit boards are connected, they conduct electricity withoutan equipotential flexible printed circuit board, and thus a process ofinstalling the equipotential flexible printed circuit board can beomitted. Accordingly, the process can be simplified to improveproductivity.

Further, the costs for providing components of the equipotentialflexible printed circuit board can be saved.

The present invention relates to a structure of a flexible printedcircuit board that makes two or more flexible printed circuit boardsconduct electricity without an equipotential flexible printed circuitboard when the flexible printed circuit boards are connected, a methodfor manufacturing the same, and an organic light emitting diodeincluding the same.

The present invention relates to a structure of a flexible printedcircuit board that makes two or more flexible printed circuit boards,which are arranged to overlap each other or to be spaced apart from eachother regardless of an equipotential flexible printed circuit board,conduct electricity through at least one of a soldering portion and awire bonding portion when the flexible printed circuit boards areconnected to each other.

In accordance with an embodiment of the present invention, there isprovided a structure of a flexible printed circuit board, which includesa substrate; two or more flexible printed circuit boards positioned atedges on the substrate and mounted with anode pads and cathode pads; andat least one of a soldering portion and a wire bonding portion whichrespectively make the anode pads and the cathode pads mounted onneighboring end portions of the flexible printed circuit boards conductelectricity.

In accordance with the present invention, the term “edge on thesubstrate” means a border or an outer portion of one surface of thesubstrate.

In accordance with the present invention, the term “neighboring” meansthat one flexible printed circuit board and another flexible printedcircuit board are located close to each other, and includes overlappingeach other (i.e., piled up), in contact with each other, and spacedapart from each other.

In accordance with the present invention, the term “mounting” meansarrangement of a device or a component on a substrate or a base throughattachment so that the device or the component is to be actually usable.

In accordance with the present invention, the flexible printed circuitboard may include an insulating film base; an anode portion and acathode portion mounted on the insulating film base; and an anode padand a cathode pad mounted in parallel on end portions of both sides ofthe insulating film base.

In this case, the anode pad and the cathode pad mounted on the endportions of both sides of the insulating film base means a pair of anodeand cathode pads mounted on one end portion of the insulating film baseand a separate pair of anode and cathode pads mounted on the other endportion of the insulating film base.

Referring to FIG. 2, the flexible printed circuit board 100 may includean insulating film base 10; an anode portion 20 and a cathode portion 25mounted on the insulating film base; and an anode pad 1 and a cathodepad 2 mounted in parallel on end portions of both sides of theinsulating film base 10.

The soldering portion means a portion that is formed by soldering, andthe wire bonding portion means a portion that is formed by wire bonding.

The soldering method may be a typical method that is known in the art,but is not limited thereto.

The wire bonding method may be a typical method that is known in theart, but is not limited thereto.

In accordance with the present invention, the two or more flexibleprinted circuit boards may not overlap each other. That is, the two ormore flexible printed circuit boards may not be piled up.

In accordance with the present invention, the two or more flexibleprinted circuit boards may be spaced apart from each other. That is, thetwo or more flexible printed circuit boards may be distant from eachother at a predetermined interval.

In this case, a gap distance between the flexible printed circuit boardsmay be longer than 0 mm and equal to or shorter than 1 mm.

As illustrated in FIG. 4, the gap distance between the flexible printedcircuit boards means a distance measured between the close end portions.

In accordance with the present invention, the flexible printed circuitboard may be a bar-type flexible printed circuit board.

In accordance with the present invention, the two or more flexibleprinted circuit boards may include four bar-type flexible printedcircuit boards.

In accordance with the present invention, in the case where thesubstrate is rectangular, one bar-type flexible printed circuit boardfor one side may be arranged at an edge, that is, a border, on thesubstrate. In this case, total four bar-type flexible printed circuitboards may be installed on respective sides of the substrate.

In this case, end portions of the flexible printed circuit boardsinstalled on four sides of the rectangular substrate may be arranged tooverlap each other or to be spaced apart from each other.

In accordance with the present invention, the width of the flexibleprinted circuit board may be 1 to 5 mm.

In accordance with the present invention, the “width” means a length ina direction that is perpendicular to the length direction, that is, alength in the width direction.

In accordance with the present invention, the anode pads and the cathodepads that are positioned on the end portions of the flexible printedcircuit board may be mounted in parallel to each other. In this case,the direction in which the anode pads and the cathode pads are mountedis not specially limited so far as the anode pads and the cathode padsare positioned on the end portions of the flexible printed circuit boardin parallel to each other.

In accordance with the present invention, the anode pads and the cathodepads that are positioned on the end portions of both sides of theflexible printed circuit board may be mounted in parallel to each other.In this case, the direction in which the anode pad and the cathode padthat are positioned on the end portion of one side are mounted and thedirection in which the anode pad and the cathode pad that are positionedon the end portion of the other side are mounted may coincide with eachother or may be different from each other.

In accordance with the present invention, the anode pad and the cathodepad that are mounted in parallel to each other on the end portion of anyone of the two or more flexible printed circuit boards and the anode padand the cathode pad that are mounted in parallel to each other on theend portions of another neighboring flexible printed circuit board mayrespectively conduct electricity through at least one of the solderingportion and the wire bonding portion.

In accordance with the present invention, the anode pad and the cathodepad that are positioned on the end portion of one side of the flexibleprinted circuit board may be mounted in parallel to each other in thelength direction of the flexible printed circuit board, and the anodepad and the cathode pad that are positioned on the end portion of theother side of the flexible printed circuit board may be mounted inparallel to each other in a direction that is perpendicular to thelength direction of the flexible printed circuit board.

As illustrated in FIG. 2, the anode pad 1 and the cathode pad 2 that arepositioned on the end portion of one side of the flexible printedcircuit board 100 may be mounted in parallel to each other in the lengthdirection of the flexible printed circuit board 100, and the anode pad 1and the cathode pad 2 that are positioned on the end portion of theother side of the flexible printed circuit board 100 may be mounted inparallel to each other in a direction that is perpendicular to thelength direction of the flexible printed circuit board 100.

In accordance with the present invention, the anode pad and the cathodepad that are mounted in the length direction of the flexible printedcircuit board on the end portion of any one of the two or more flexibleprinted circuit boards and the anode pad and the cathode pad that aremounted in a direction that is perpendicular to the length direction ofthe flexible printed circuit board on the end portions of anotherneighboring flexible printed circuit board may respectively conductelectricity through at least one of the soldering portion and the wirebonding portion.

As illustrated in FIG. 5, the anode pad and the cathode pad that aremounted in the length direction of the flexible printed circuit board100 on the end portion of any one of the two or more flexible printedcircuit boards and the anode pad and the cathode pad that are mounted ina direction that is perpendicular to the length direction of theflexible printed circuit board on the end portions of anotherneighboring flexible printed circuit board may respectively conductelectricity through at least one of the soldering portion and the wirebonding portion 30.

In accordance with the present invention, the width of the solderingportion may be 0.1 to 2 mm.

In accordance with the present invention, the soldering portion mayinclude any one of brass solder, silver solder, german silver solder,manganese solder, gold solder, a lead-tin alloy, a lead-tin-zinc alloy,a lead-cadmium alloy, zinc-cadmium solder and a lead-tin-bismuth-basedalloy.

In accordance with the present invention, the wire bonding portion mayinclude a wire having a diameter of 0.1 to 2 mm.

In accordance with the present invention, the structure of the flexibleprinted circuit board may further include an anisotropic conductive filmpositioned between the substrate and the flexible printed circuit boardto correspond to the flexible printed circuit board.

More specifically, in accordance with an embodiment of the presentinvention, there is provided a structure of a flexible printed circuitboard, which includes a substrate; an anisotropic conductive filmpositioned at an edge on the substrate; flexible printed circuit boardspositioned on the anisotropic conductive film; and at least one of asoldering portion and a wire bonding portion which respectively makeanode pads and cathode pads mounted on neighboring end portions of theflexible printed circuit boards conduct electricity.

In accordance with another embodiment of the present invention, there isprovided a structure of a flexible printed circuit board, which includesa substrate; a pair of lower flexible printed circuit boards facing eachother at edges on the substrate and mounted with anode pads and cathodepads; and a pair of upper flexible printed circuit boards facing eachother at the edges on the substrate to partially overlap the lowerflexible printed circuit boards, and mounted with anode pads and cathodepads, wherein the anode pads and the cathode pads of the overlappingupper flexible printed circuit boards and the anode pads and the cathodepads of the lower flexible printed circuit boards respectively conductelectricity by a conductive material which fills a hole formed in aportion of the upper flexible circuit board that overlaps the lowerflexible printed circuit board.

In accordance with the present invention, the term “the lower flexibleprinted circuit board and the upper flexible printed circuit board arepositioned to partially overlap each other” means that the lowerflexible printed circuit board and the upper flexible printed circuitboard overlap each other, and unless the lower flexible printed circuitboard and the upper flexible printed circuit board are parallel to eachother, the overlapping position is not specially limited. In this case,that the lower flexible printed circuit board and the upper flexibleprinted circuit board are not parallel to each other means that an acuteangle made between the lower flexible printed circuit board and theupper flexible printed circuit board is larger than 0° and equal to orsmaller than 90°.

Referring to FIG. 6, if the acute angle formed between the lowerflexible printed circuit board 150 and the upper flexible printedcircuit board 160 is 90°, the structure may be shown as illustrated inFIG. 6. In this case, the anode pad and the cathode pad of the upperflexible printed circuit board and the anode pad and the cathode pad ofthe lower flexible printed circuit board respectively conductelectricity by a conductive material which fills a hole 50 formed in aportion of the upper flexible printed circuit board 160 that overlapsthe lower flexible printed circuit board.

In accordance with the present invention, the term “the anode pad andthe cathode pad respectively conduct electricity” means that the anodepads are connected to each other with a conductive material, and thecathode pads are connected to each other with a conductive material,through which current flows.

Specifically, this means that the anode pad of the upper flexibleprinted circuit board and the anode pad of the lower flexible printedcircuit board, which overlap each other, are made to conduct current bythe conductive material that fills the hole, and the cathode pad of theupper flexible printed circuit board and the cathode pad of the lowerflexible printed circuit board, which overlap each other, are made toconduct current by the conductive material that fills the hole.

The conductive material is not specially limited so far as theconductive material can make current flow without exerting an influenceon the flexible printed circuit board and can fill the hole formed inthe upper flexible printed circuit board.

In accordance with the present invention, an end portion of the upperflexible printed circuit board may overlap an end portion of the lowerflexible printed circuit board.

In accordance with the present invention, the upper flexible printedcircuit board and the lower flexible printed circuit board may bebar-type flexible printed circuit boards.

In accordance with the present invention, the width of the upper orlower flexible printed circuit board may be 1 to 5 mm.

In accordance with the present invention, the hole may be respectivelyformed at the anode pad and the cathode pad of the upper flexibleprinted circuit board.

In this case, it is preferable that the distance between the hole thatis formed at the anode pad and the hole that is formed at the cathodepad becomes longer when the hole is respectively formed at the anode padand the cathode pad of the upper flexible printed circuit board.Accordingly, the hole that is formed at the anode pad and the hole thatis formed at the cathode pad may be in a diagonal form. This means thatan angle that is made by a line connected between the center of the holeformed at the anode pad and the center of the hole formed at cathode padwith respect to the length direction of the anode pad or the cathode padis not right-angled or parallel. More specifically, this means that theacute angle made by the line connected between the center of the holeformed at the anode pad and the center of the hole formed at cathode padwith respect to the length direction of the anode pad or the cathode padis larger than 0° and equal to or smaller than 90°.

In accordance with the present invention, the diameter of the hole isnot specially limited unless short occurs by the conductive materialthat fills the hole. For example, the diameter of the hole may be equalto or smaller than the width of the anode pad and the cathode pad.

In accordance with the present invention, the distance between thecenter of the hole of the anode pad and the center of the hole of thecathode pad may be 0.5 to 2 mm.

In accordance with the present invention, the conductive material mayinclude lead. Specifically, the conductive material may fill the hole bysoldering.

In accordance with the present invention, the conductive material may beany one of brass solder, silver solder, german silver solder, manganesesolder, gold solder, a lead-tin alloy, a lead-tin-zinc alloy, alead-cadmium alloy, zinc-cadmium solder and a lead-tin-bismuth-basedalloy.

In accordance with the present invention, the upper flexible printedcircuit board and the lower flexible printed circuit board may have amultilayer structure including two or more layers.

In accordance with the present invention, if the upper flexible printedcircuit board has a multilayer structure including two or more layers,the uppermost layer of the upper flexible printed circuit board may beinstalled to extend in the length direction of the upper flexibleprinted circuit board, and may be positioned so that an end portion ofthe uppermost layer of the upper flexible printed circuit board overlapsthe lower flexible printed circuit board.

In accordance with the present invention, if the upper flexible printedcircuit board and the lower flexible printed circuit board have amultilayer structure including two or more layers, the uppermost layerof the flexible printed circuit board serves as an electrode portionthat transfers the power from an outside to a light emitting portion.

In accordance with the present invention, if the upper flexible printedcircuit board and the lower flexible printed circuit board have amultilayer structure including three or more layers, the uppermost layerof the flexible printed circuit board serves as an electrode portionthat transfers the power from an outside to a light emitting portion, anintermediate layer of the flexible printed circuit board serves to makethe same electrodes that are spaced apart from each other equipotential,and the lowermost layer of the flexible printed circuit board iscombined with the electrode of the light emitting portion through theanisotropic conductive film to transfer the power that is supplied fromthe uppermost layer of the flexible printed circuit board to the lightemitting portion.

The material of the flexible printed circuit board may be a generalmaterial in the art, and is not specially limited. For example, a linethat is obtained by plating gold (Au) onto copper (Cu) may be used as acircuit line, and the circuit line is insulated from an outside using apolyimide film to conduct electricity.

In accordance with the present invention, the term “uppermost layer”means a layer that is positioned relatively far from the substrate, theterm “lowermost layer” means a layer that is positioned relatively closeto the substrate, and the term “intermediate layer” means a layer thatis positioned between the uppermost layer and the lowermost layer.

If the upper flexible printed circuit board overlaps the lower flexibleprinted circuit board, as illustrated in FIG. 9, the upper flexibleprinted circuit board is bent, and thus the indicated portion may bedamaged.

In this case, as illustrated in FIG. 10, the upper flexible printedcircuit board may have a multilayer structure, the uppermost layer 180of the upper flexible printed circuit board may extend in the lengthdirection of the upper flexible printed circuit board to form aprotrusion, and the end portion (i.e., protrusion) of the uppermostlayer 180 of the upper flexible printed circuit board may overlap thelower flexible printed circuit board 150.

In accordance with the present invention, the hole may be respectivelyformed at the anode pad and the cathode pad formed on the end portion ofthe uppermost layer of the upper flexible printed circuit board havingthe multilayer structure.

In accordance with the present invention, the flexible printed circuitboard may further include an anisotropic conductive film positionedbetween the substrate and the flexible printed circuit board tocorrespond to the flexible printed circuit board.

In accordance with other embodiment of the present invention, there isprovided a flexible printed circuit board on which an anode leadterminal and a cathode lead terminal are installed to protrude from atleast one end portion thereof in the length direction of the flexibleprinted circuit board.

Referring to FIG. 3, the flexible printed circuit board 100 may includean insulating film base material 10; an anode portion 20 and a cathodeportion 25 mounted on the insulating film base material 10; an anode pad1 and a cathode pad 2 mounted in parallel to each other on an endportion of one side of the insulating film base material 10; and ananode lead terminal 5 and a cathode lead terminal 6 protruding in alength direction of the flexible printed circuit board.

In accordance with the present invention, there is provided a structureof a flexible printed circuit board, which includes a substrate; and twoor more flexible printed circuit boards positioned at edges on thesubstrate, wherein an anode lead terminal and a cathode lead terminalare installed on an end portion of one side of the flexible printedcircuit board to protrude in a length direction of the flexible printedcircuit board, an anode pad and a cathode pad are mounted on an endportion of the other side of the flexible printed circuit board, and theanode lead terminal and the cathode lead terminal of any one of theflexible printed circuit boards correspondingly overlap the anode padand the cathode pad of the end portion of another neighboring flexibleprinted circuit boards to conduct electricity with each other through aconductive material.

As illustrated in FIG. 7, an anode lead terminal 5 and a cathode leadterminal 6 may be installed on an end portion of one side of theflexible printed circuit board 100 to protrude in the length directionof the flexible printed circuit board, an anode pad 1 and a cathode pad2 may be mounted on an end portion of the other side of the flexibleprinted circuit board, and the anode lead terminal 5 and the cathodelead terminal 6 of any one of the flexible printed circuit boardsoverlap the anode pad 1 and the cathode pad 2 of the end portion ofanother neighboring flexible printed circuit boards to conductelectricity with each other through a conductive material.

In accordance with the present invention, there is provided a structureof a flexible printed circuit board, which includes a substrate; a pairof lower flexible printed circuit boards facing each other at edges onthe substrate and provided with anode pads and cathode pads that aremounted on end portions of both sides thereof; and a pair of upperflexible printed circuit boards facing each other at the edges on thesubstrate and provided with anode lead terminals and cathode leadterminals that are installed on end portions of both sides thereof toprotrude in the length direction, wherein the anode lead terminals andthe cathode lead terminals of the upper flexible printed circuit boards,which neighbors the lower flexible printed circuit boards,correspondingly overlap the anode pads and the cathode pads of the lowerflexible printed circuit boards to conduct electricity with each otherthrough a conductive material.

As illustrated in FIG. 8, the anode lead terminal 5 and the cathode leadterminal 6 of the upper flexible printed circuit board 160, whichneighbors the lower flexible printed circuit board 150, correspondinglyoverlaps the anode pad 1 and the cathode pad 2 of the lower flexibleprinted circuit board 150 to conduct electricity with each other througha conductive material.

In accordance with the present invention, the flexible printed circuitboard may be a bar-type flexible printed circuit board.

In accordance with the present invention, the width of the flexibleprinted circuit board may be 1 to 5 mm.

In accordance with the present invention, the anode pad and the cathodepad mounted on the flexible printed circuit board may be in parallel toeach other in a direction that is perpendicular to the length directionof the flexible printed circuit board.

In accordance with the present invention, the conductive material may beformed by soldering.

In accordance with the present invention, the solder used for solderingmay be any one of brass solder, silver solder, german silver solder,manganese solder, gold solder, a lead-tin alloy, a lead-tin-zinc alloy,a lead-cadmium alloy, zinc-cadmium solder and a lead-tin-bismuth-basedalloy.

In accordance with the present invention, the flexible printed circuitboard may have a multilayer structure including two or more layers.

In accordance with the present invention, the anode lead terminal andthe cathode lead terminal may protrude from an end portion of theoutermost layer of the flexible printed circuit board in the lengthdirection of the flexible printed circuit board.

As illustrated in FIG. 10, the upper flexible printed circuit board mayhave a multilayer structure, and the anode lead terminal and the cathodelead terminal may protrude from the end portion of the uppermost layer180 of the upper flexible printed circuit board in the length directionof the flexible printed circuit board. In this case, the anode leadterminal and the cathode lead terminal may correspond to the protrusionin FIG. 10, and the anode lead terminal and the cathode lead terminal(i.e., protrusion), which are installed on the uppermost layer 180 ofthe upper flexible printed circuit board, may be positioned on the lowerflexible printed circuit board 150 to overlap each other.

In accordance with the present invention, the flexible printed circuitboard may further include an anisotropic conductive film positionedbetween the substrate and the flexible printed circuit board tocorrespond to the flexible printed circuit board.

In accordance with the present invention, there is provided a method formanufacturing a structure of a flexible printed circuit board, whichincludes 1) installing two or more flexible printed circuit boards atedges on a substrate; and 2) making the neighboring flexible printedcircuit boards conduct electricity using at least one of soldering andwire bonding.

In accordance with the present invention, the term “edge on thesubstrate” means a border or an outer portion of one surface of thesubstrate.

In accordance with the present invention, the term “neighboring” meansthat one flexible printed circuit board and another flexible printedcircuit board are located close to each other, and includes overlappingeach other (i.e., piled up), in contact with each other, and spacedapart from each other.

The soldering method may be a typical method that is known in the art,but is not limited thereto.

The wire bonding method may be a typical method that is known in theart, but is not limited thereto.

In accordance with the present invention, the flexible printed circuitboard may be a bar-type flexible printed circuit board.

In accordance with the present invention, the two or more flexibleprinted circuit boards may include four bar-type flexible printedcircuit boards.

In accordance with the present invention, in the case where thesubstrate is rectangular, one bar-type flexible printed circuit boardfor one side may be arranged at an edge, that is, a border, on thesubstrate. In this case, total four bar-type flexible printed circuitboards may be installed on respective sides of the substrate.

In this case, end portions of the flexible printed circuit boardsinstalled on four sides of the rectangular substrate may be arranged tooverlap each other or to be spaced apart from each other.

In accordance with the present invention, the width of the flexibleprinted circuit board may be 1 to 5 mm.

In accordance with the present invention, the width of the soldering maybe 0.1 to 2 mm.

In accordance with the present invention, the solder used for solderingmay be any one of brass solder, silver solder, german silver solder,manganese solder, gold solder, a lead-tin alloy, a lead-tin-zinc alloy,a lead-cadmium alloy, zinc-cadmium solder and a lead-tin-bismuth-basedalloy.

In accordance with the present invention, a wire that is used for wirebonding may have a diameter of 0.1 to 2 mm.

In accordance with the present invention, the method for manufacturing astructure of a flexible printed circuit board may further includeinstalling an anisotropic conductive film in a position that correspondsto the flexible printed circuit board on the substrate before the step1).

Specifically, after the anisotropic conductive film is installed at anedge on the substrate, two or more flexible printed circuit boards areinstalled on the anisotropic conductive film. Thereafter, theneighboring flexible printed circuit boards may be made to conductelectricity using at least one of soldering and wire bonding.

As illustrated in FIG. 11, specifically, after the anisotropicconductive film is installed at an edge on the substrate, two or moreflexible printed circuit boards are installed on the anisotropicconductive film. Thereafter, the neighboring flexible printed circuitboards may be made to conduct electricity using at least one ofsoldering and wire bonding.

In accordance with the present invention, the two or more flexibleprinted circuit boards may not overlap each other. That is, the two ormore flexible printed circuit boards may not be piled up.

In accordance with the present invention, the two or more flexibleprinted circuit boards may be spaced apart from each other. That is, thetwo or more flexible printed circuit boards may be distant from eachother at a predetermined interval.

In this case, a gap distance between the flexible printed circuit boardsmay be longer than 0 mm and equal to or shorter than 1 mm.

In accordance with the present invention, anode pads and cathode padsare mounted on the two or more flexible printed circuit boards, and instep 2), the anode pads and the cathode pads, which are mounted onneighboring end portions of the flexible printed circuit boards, may bemade to conduct electricity using at least one of soldering and wirebonding.

In this case, when the anode pads and the cathode pads, which aremounted on the neighboring end portions of the flexible printed circuitboards, are made to conduct electricity, the anode pads are connected toeach other using at least one of soldering and wire bonding to conductcurrent, and the cathode pads are connected to each other using at leastone of soldering and wire bonding to conduct current.

In accordance with the present invention, the anode pads and the cathodepads that are positioned on the end portions of the flexible printedcircuit board may be mounted in parallel to each other. In this case,the direction in which the anode pads and the cathode pads are mountedis not specially limited so far as the anode pads and the cathode padsare positioned on the end portions of the flexible printed circuit boardin parallel to each other.

In accordance with the present invention, the anode pads and the cathodepads that are positioned on the end portions of both sides of theflexible printed circuit board may be mounted in parallel to each other.In this case, the direction in which the anode pad and the cathode padthat are positioned on the end portion of one side of the flexibleprinted circuit board and the direction in which the anode pad and thecathode pad that are positioned on the end portion of the other side ofthe flexible printed circuit board may coincide with each other or maybe different from each other.

In accordance with the present invention, the anode pad and the cathodepad that are mounted in parallel to each other on the end portion of anyone of the two or more flexible printed circuit boards and the anode padand the cathode pad that are mounted in parallel to each other on theend portions of another neighboring flexible printed circuit board mayrespectively conduct electricity through at least one of the solderingportion and the wire bonding portion.

In accordance with the present invention, the anode pad and the cathodepad that are positioned on the end portion of one side of the flexibleprinted circuit board may be mounted in parallel to each other in thelength direction of the flexible printed circuit board, and the anodepad and the cathode pad that are positioned on the end portion of theother side of the flexible printed circuit board may be mounted inparallel to each other in a direction that is perpendicular to thelength direction of the flexible printed circuit board.

In accordance with the present invention, in step 2), the anode pad andthe cathode pad that are mounted in the length direction of the flexibleprinted circuit board on the end portion of any one of the two or moreflexible printed circuit boards and the anode pad and the cathode padthat are mounted in a direction that is perpendicular to the lengthdirection of the flexible printed circuit board on the end portions ofanother neighboring flexible printed circuit board may respectivelyconduct electricity using at least one of soldering and wire bonding.

In accordance with the present invention, the step 1) may be a step ofinstalling a pair of lower flexible printed circuit boards facing eachother at edges on the substrate and mounted with anode pads and cathodepads, and a pair of upper flexible printed circuit boards facing eachother at the edges on the substrate to partially overlap the lowerflexible printed circuit boards and mounted with anode pads and cathodepads, and the step 2) may be a step of forming a hole in a portion ofthe upper flexible circuit board that overlaps the lower flexibleprinted circuit board, and making the anode pads and the cathode pads ofthe upper flexible printed circuit boards and the anode pads and thecathode pads of the lower flexible printed circuit boards, which overlapeach other, conduct electricity by solder that fills a hole throughsoldering.

In accordance with the present invention, the step 1) may install thepairs of the lower and upper flexible printed circuit boards so that anend portion of the upper flexible printed circuit board overlaps an endportion of the lower flexible printed circuit board.

In accordance with the present invention, the hole may be formed at theanode pad and the cathode pad of the upper flexible printed circuitboard.

In accordance with the present invention, the diameter of the hole maybe equal to or smaller than the width of the anode pad and the cathodepad.

In accordance with the present invention, the distance between thecenter of the hole of the anode pad and the center of the hole of theanode pad may be 0.5 to 2 mm.

In accordance with the present invention, the upper flexible printedcircuit board and the lower flexible printed circuit board may have amultilayer structure including two or more layers.

In accordance with the present invention, the outermost layer of theupper flexible printed circuit board may be installed to extend in thelength direction of the upper flexible printed circuit board, and may bepositioned on the lower flexible printed circuit board so that an endportion of the outermost layer of the upper flexible printed circuitboard overlaps the lower flexible printed circuit board.

In accordance with the present invention, an anode lead terminal and acathode lead terminal are installed on an end portion of one side of theflexible printed circuit board to protrude in a length direction of theflexible printed circuit board, an anode pad and a cathode pad aremounted on an end portion of the other side of the flexible printedcircuit board, and in step 2), the anode lead terminal and the cathodelead terminal of any one of the flexible printed circuit boardscorrespondingly overlap the anode pad and the cathode pad of the endportion of another neighboring flexible printed circuit boards toconduct electricity with each other by soldering.

In accordance with the present invention, the step 1) may be a step ofinstalling a pair of lower flexible printed circuit boards facing eachother at edges on the substrate and having anode pads and cathode padsmounted on end portions of both sides thereof, and a pair of upperflexible printed circuit boards facing each other at the edges on thesubstrate and having an anode lead terminal and a cathode lead terminalinstalled to protrude in the length direction on the end portions ofboth sides thereof, and the step 2) may be a step of making the anodelead terminal and the cathode lead terminal of the upper flexibleprinted circuit board correspondingly overlap the anode pad and thecathode pad of the lower flexible printed circuit board to conductelectricity with each other by soldering.

In accordance with the present invention, the flexible printed circuitboard may have a multilayer structure including two or more layers.

In accordance with the present invention, the anode lead terminal andthe cathode lead terminal may protrude in the length direction of theflexible printed circuit board on the end portion of the outermost layerof the flexible printed circuit board.

In the method for manufacturing the flexible printed circuit board,explanation of the duplicate configuration of the structure of theflexible printed circuit board is quotable in the same manner.

In accordance with the present invention, there is provided a displaydevice including the structure of the flexible printed circuit board asdescribed above.

The display device may be any one of a plasma display panel (PDP), atouch panel, a light emitting diode (LED), an organic light emittingdiode (OLED), a liquid crystal display (LCD), a thin filmtransistor-liquid crystal display (LCD-TFT), and a cathode ray tube(CRT).

In accordance with the present invention, there is provided an organiclight emitting diode including the structure of the flexible printedcircuit board.

In the organic light emitting diode, explanation of the duplicateconfiguration of the structure of the flexible printed circuit board isquotable in the same manner.

In accordance with the present invention, there is provided an organiclight emitting diode, which includes a substrate that includes a displayportion for displaying an image and a non-display portion positioned onan outer side thereof; two or more flexible printed circuit boardspositioned in the non-display portion; and at least one of a solderingportion and a wire bonding portion which make the neighboring flexibleprinted circuit boards conduct electricity.

In accordance with the present invention, the flexible printed circuitboard may be a bar-type flexible printed circuit board.

In accordance with the present invention, the two or more flexibleprinted circuit boards may include four bar-type flexible printedcircuit boards.

In accordance with the present invention, the width of the flexibleprinted circuit board may be 1 to 5 mm.

In accordance with the present invention, the width of the solderingportion may be 0.1 to 2 mm.

In accordance with the present invention, the soldering portion mayinclude any one of brass solder, silver solder, german silver solder,manganese solder, gold solder, a lead-tin alloy, a lead-tin-zinc alloy,a lead-cadmium alloy, zinc-cadmium solder and a lead-tin-bismuth-basedalloy.

In accordance with the present invention, the wire bonding portion mayinclude a wire having a diameter of 0.1 to 2 mm.

In accordance with the present invention, the organic light emittingdiode may further include an anisotropic conductive film positionedbetween the substrate and the flexible printed circuit board tocorrespond to the flexible printed circuit board.

As illustrated in FIG. 12, the organic light emitting diode may furtherinclude an anisotropic conductive film positioned between the substrateand the flexible printed circuit board to correspond to the flexibleprinted circuit board.

The anisotropic conductive film is used as a material that conductselectricity as the flexible printed circuit board is adhered to thesubstrate, and is in a double-sided tape state in which adhesives thatare cured by heat and fine conductive balls are mixed. Ifhigh-temperature pressure is applied to the anisotropic conductive film,the conductive balls in a portion that comes in contact with the pads ofthe circuit pattern are broken, and the broken conductive balls achieveconduction between the pads while the adhesives are cured in portionsexcept for the pad portions to achieve adhesion to each other. Theanisotropic conductive film adhered as described above has conductivityin the thickness direction to conduct electricity and has insulation inthe horizontal direction.

In accordance with the present invention, the two or more flexibleprinted circuit boards may not overlap each other.

In accordance with the present invention, the two or more flexibleprinted circuit boards may be spaced apart from each other.

In accordance with the present invention, a gap distance between theflexible printed circuit boards may be longer than 0 mm and equal to orshorter than 1 mm.

In accordance with the present invention, the anode pads and the cathodepads may be mounted on the two or more flexible printed circuit boards,and the soldering portion and the wire bonding portion may make theanode pads and the cathode pads mounted on neighboring portions of theflexible printed circuit boards conduct electricity.

In accordance with the present invention, the anode pads and the cathodepads that are positioned on the end portions of the flexible printedcircuit board may be mounted in parallel to each other.

In accordance with the present invention, the anode pad and the cathodepad that are positioned on the end portion of one side of the flexibleprinted circuit board may be mounted in parallel to each other in thelength direction of the flexible printed circuit board, and the anodepad and the cathode pad that are positioned on the end portion of theother side of the flexible printed circuit board may be mounted inparallel to each other in a direction that is perpendicular to thelength direction of the flexible printed circuit board.

In accordance with the present invention, the anode pad and the cathodepad that are mounted in the length direction of the flexible printedcircuit board on the end portion of any one of the two or more flexibleprinted circuit boards and the anode pad and the cathode pad that aremounted in a direction that is perpendicular to the length direction ofthe flexible printed circuit board on the end portions of anotherneighboring flexible printed circuit board may respectively conductelectricity through at least one of the soldering portion and the wirebonding portion.

In accordance with the present invention, the two or more flexibleprinted circuit boards may include a pair of lower flexible printedcircuit boards facing each other in the non-display portion and mountedwith anode pads and cathode pads, and a pair of upper flexible printedcircuit boards facing each other in the non-display portion to partiallyoverlap the lower flexible printed circuit boards, and mounted withanode pads and cathode pads, wherein the anode pads and the cathode padsof the overlapping upper flexible printed circuit boards and the anodepads and the cathode pads of the lower flexible printed circuit boardsrespectively conduct electricity by the soldering portion which fills ahole formed in a portion of the upper flexible circuit board thatoverlaps the lower flexible printed circuit board.

In accordance with the present invention, an end portion of the upperflexible printed circuit board may overlap an end portion of the lowerflexible printed circuit board.

In accordance with the present invention, the hole may be formed at theanode pad and the cathode pad of the upper flexible printed circuitboard.

In accordance with the present invention, the diameter of the hole maybe equal to or smaller than the width of the anode pad and the cathodepad.

In accordance with the present invention, the distance between thecenter of the hole of the anode pad and the center of the hole of thecathode pad may be 0.5 to 2 mm.

In accordance with the present invention, the upper flexible printedcircuit board and the lower flexible printed circuit board may have amultilayer structure including two or more layers.

In accordance with the present invention, the outermost layer of theupper flexible printed circuit board may be installed to extend in thelength direction of the upper flexible printed circuit board, and may bepositioned on the lower flexible printed circuit board so that an endportion of the outermost layer of the upper flexible printed circuitboard overlaps the lower flexible printed circuit board.

In accordance with the present invention, an anode lead terminal and acathode lead terminal are installed on an end portion of one side of theflexible printed circuit board to protrude in the length direction ofthe flexible printed circuit board, an anode pad and a cathode pad aremounted on an end portion of the other side of the flexible printedcircuit board, and the anode lead terminal and the cathode lead terminalof any one of the flexible printed circuit boards correspondinglyoverlap the anode pad and the cathode pad of the end portion of anotherneighboring flexible printed circuit boards to conduct electricity witheach other by the soldering portion.

In accordance with the present invention, the two or more flexibleprinted circuit boards may include a pair of lower flexible printedcircuit boards facing each other in the non-display portion and havinganode pads and cathode pads mounted on end portions of both sidesthereof, and a pair of upper flexible printed circuit boards facing eachother in the non-display portion and having an anode lead terminal and acathode lead terminal installed to protrude from the end portions ofboth sides thereof in the length direction thereof, wherein the anodelead terminal and the cathode lead terminal of any one of the flexibleprinted circuit boards correspondingly overlap the anode pad and thecathode pad on the end portion of another neighboring flexible printedcircuit boards to conduct electricity with each other by the solderingportion.

In accordance with the present invention, the flexible printed circuitboard may have a multilayer structure including two or more layers.

In accordance with the present invention, the anode lead terminal andthe cathode lead terminal may protrude in the length direction of theflexible printed circuit board on the end portion of the outermost layerof the flexible printed circuit board.

DESCRIPTION OF REFERENCE NUMERALS IN THE DRAWING

-   -   1: anode pad    -   2: cathode pad    -   5: anode lead terminal    -   6: cathode lead terminal    -   10: insulating film base material    -   20: anode portion    -   25: cathode portion    -   30: soldering portion or wire bonding portion    -   50: hole    -   100: flexible printed circuit board    -   150: lower flexible printed circuit board    -   160: upper flexible printed circuit board    -   180: uppermost layer of an upper flexible printed circuit board

The invention claimed is:
 1. A display device comprising: a displaypanel including a substrate having a display portion and non-displayportion positioned on an outer side of the display portion, and astructure of a flexible printed circuit board positioned in thenon-display area, wherein the structure of a flexible printed circuitboard comprising two or more flexible printed circuit boards positionedat edges on the substrate and mounted with anode pads and cathode pads,the two or more flexible printed circuit boards including a firstflexible printed circuit board and a second flexible printed circuitboard, wherein at least one of a soldering portion and a wire bondingportion which respectively make the anode pads and the cathode padsmounted on neighboring end portions of the first and second flexibleprinted circuit boards conduct electricity, wherein a first end of theat least one of a soldering portion and a wire bonding portion isconnected with the anode pad or the cathode pad of the first flexibleprinted circuit board, and a second end of the at least one of asoldering portion and a wire bonding portion is connected with the anodepad or the cathode pad of the second flexible printed circuit board, andwherein the first flexible printed circuit board has an end portion andthe second flexible printed circuit board has an end portion, the endportion of the first flexible printed circuit board overlaps the endportion of the second flexible printed circuit board, and the at leastone of a soldering portion and a wire bonding portion overlaps each ofthe end portion of the first flexible printed circuit board and the endportion of the second flexible printed circuit board.
 2. The displaydevice of claim 1, wherein the display device is any one of a plasmadisplay panel (PDP), a touch panel, a light emitting diode (LED), anorganic light emitting diode (OLED), a liquid crystal display (LCD), athin film transistor-liquid crystal display (LCD-TFT), and a cathode raytube (CRT).
 3. The display device of claim 1, wherein the two or moreflexible printed circuit board are a bar-type flexible printed circuitboards.
 4. The display device of claim 1, wherein the two or moreflexible printed circuit boards include four bar-type flexible printedcircuit boards.
 5. The display device of claim 1, wherein a width of theflexible printed circuit board is 1 to 5 mm.
 6. The display device ofclaim 1, wherein the anode pads and the cathode pads that are positionedon the end portions of the flexible printed circuit board are mounted inparallel to each other.
 7. The display device of claim 1, wherein theanode pads and the cathode pads that are positioned on the end portionsof one side of the flexible printed circuit board are mounted inparallel to each other in a length direction of the flexible printedcircuit board, and the anode pads and the cathode pads that arepositioned on the end portions of the other side of the flexible printedcircuit board are mounted in parallel to each other in a direction thatis perpendicular to the length direction of the flexible printed circuitboard.
 8. The display device of claim 7, wherein the anode pad and thecathode pad that are mounted in the length direction of the flexibleprinted circuit board on the end portion of any one of the two or moreflexible printed circuit boards and the anode pad and the cathode padthat are mounted in the direction that is perpendicular to the lengthdirection of the flexible printed circuit board on the end portion ofanother neighboring flexible printed circuit board respectively conductelectricity through at least one of the soldering portion and the wirebonding portion.
 9. The display device of claim 1, wherein a width ofthe soldering portion is 0.1 to 2 mm.
 10. The display device of claim 1,wherein the soldering portion includes any one of brass solder, silversolder, german silver solder, manganese solder, gold solder, a lead-tinalloy, a lead-tin-zinc alloy, a lead-cadmium alloy, zinc-cadmium solderand a lead-tin-bismuth-based alloy.
 11. The display device of claim 1,wherein the wire bonding portion has a diameter of 0.1 to 2 mm.
 12. Thedisplay device of claim 1, further comprising an anisotropic conductivefilm positioned between the substrate and the flexible printed circuitboard to correspond to the flexible printed circuit board.